SM-B79
SM-B79 User Manual - Rev. First Edition: 1.0 - Last Edition: 1.0 - Author: A.R - Reviewed by M.B. - Copyright © 2021 SECO S.p.A.
70
3.3.26
Feature Header
For further expandability of the system, on SM-B79 carrier board, are carried others
signals available from SMARC
®
cad edge connector.
For this purpose, it is available a dual row 40-pin p 2.54 mm pin header, type
ADIMPEX p/n LE008240-R.
Signal description:
GP_I2C_DAT_3V3: General Purpose I2C I/O Data Signal, derived from SMARC
®
I2C_GP_DAT with a set of back to back FETs to voltage translate. +3.3V_RUN
electrical level with 2k2
up resistor. Also carried to I2S Audio Header CN81
(par.3.3.17)
GP_I2C_CLK_3V3: General Purpose I2C Clock Output Signal, derived from
SMARC
®
I2C_GP_CK with a set of back to back FETs to voltage translate.
. Also carried to I2S Audio
Header CN81 (par.3.3.17)
SER1_TX / SER1_RX: SMARC
®
module SER#1 Asynchronous Serial Data pairs,
routing to this header is driven by dual DIP switch SW7 (par.) that must set 1-3 switch
in OFF position
SER3_TX / SER3_RX: SMARC
®
module SER#3 Asynchronous Serial Data pairs
SUS_S3#_3V3: Signal indicating the system is in Suspend to RAM (S3) state. Active
Low Output Signal with a 10
®
module
CARRIER_STBY#
SUS_S5#_3.3V_A: Signal indicating the system is in Soft Off (S5) state. Active Low
Output Signal, driven by SMARC
®
module CARRIER_PWR_ON
CHARGING#: SMARC
®
module Battery Charging Input Signal, active low
CHARGER_PRSNT#: SMARC
®
module Battery Charger Present Input Signal, active
low
BATLOW#: SMARC
®
module Battery Low indication signal, active low
GBE0_SDP: SMARC
®
module IEEE 1588 Trigger Signal for Hardware
Implementation of PTP (Precision Time Protocol)
GBE1_SDP: SMARC
®
module IEEE 1588 Trigger Signal for Hardware
Feature header CN45
Pin Signal
Pin Signal
1
+5V_RUN (with 750mA resettable
fuse)
2
+5V_ALW (with 750mA resettable
fuse)
3
330Ohm Pull-up to 5V_RUN
4
SATA_ACT#
5
GP_I2C_DAT_3V3
6
SMB_CLK_BAT
7
GP_I2C_CLK_3V3
8
SMB_DAT_BAT
9
SER1_TX
10
GND
11
SER1_RX
12
+3V3_RUN (with 750mA
resettable fuse)
13
CHARGING#
14
+3V3_ALW (with 750mA
resettable fuse)
15
SUS_S3#_3V3
16
+3V3_DSW (with 750mA
resettable fuse)
17
GND
18
GND
19
CHARGER_PRSNT#
20
SMB_ALERT#
21
---
22
SUS_S5#_3.3V_A
23
GBE1_SDP
24
---
25
---
26
SUS_S5#_3.3V_A
27
WDT_TIME_OUT#
28
RESET_OUT#
29
TEST#
30
LID#
31
BATLOW#
32
SER3_TX
33
GBE0_SDP
34
SER3_RX
35
SLEEP#
36
RESET_IN#
37
GND
38
GND
39
POWER_BTN#
40
VIN_PWR_BAD#